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Combi boilers are an energy-efficient option for heating any home. Boasting a compact design that contains all its part in one unit, combi boilers take less time than traditional boilers to create heat. Acquiring services for a combi boiler installation is essential to its overall productivity and efficiency, so it is imperative you enlist a professional. Luckily, experts familiar with combi boiler installation should be able to complete the job in no more than a few hours.

While it may take a short amount of time for a combi boiler installation to be completed, it is not always the cheapest option. Because combi boilers are designed differently than older boiler models, the cost of installation largely is dependent upon size and other practical factors, such as whether or not radiators need to be replaced and the length of the flue to vent unnecessary gases. Additionally, you may need a professional to remove your old water tanks, so while the actual combi boiler installation is quick, other factors may cause it to take a couple of days for the complete installation.

To better help you with all the combi boiler installation details, we have created a quick guide that will help explain the entire process.

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How much does a combi boiler cost?

 To start, you will need to decide if you are going to purchase a brand new unit or a recycled combi boiler. Prices will vary depending on which outlet you go through as well as the size and make of your boiler.


You will have many options when looking at wholesalers and retailers. They include but are not limited to high-street retailers such as Tap Store or Primrose Bathrooms, local plumbers in your area, or even online companies such as the OneStopBoilerShop. Costs will generally be cheaper online, especially if you shop around (often as little as £200 – £300 for the really simple models!), but going to local shops or traders will enable you to negotiate a better deal in person, one that often includes installation and a warranty and/or guarantee in the asking price.


The next step is to check with your energy company, as combi boiler installation prices will vary depending on the company. However,  generally n-power and British Gas are considered the more expensive options (around £1,000 – £1,500). Combi boiler installation costs from smaller companies such as E-on UK or EDF Energy come in at around £600 – £800.


Again, it is imperative to remember the overall cost of your combi boiler will vary depending on the brand and quality of the model you decide to go with. Combi boilers from manufacturers such as Glow-Worm or Worcester Bosch usually cost between £750 and £1,300 including installation; while lesser quality models such as Baxi or Corgi generally charge closer to the £500 – £800 mark.oiw

As an alternative option, you may first look at the amount of work that must be completed before you decide which combi boiler to go with. Here are some examples that range from some of the cheapest to most expensive cost scenarios:

  • Installing a combi boiler in a prepared area: £600 – £800
  • Installing a combi boiler in a new area that may need re-sizing: £650 – £900
  • Installing a combi boiler and new radiators (including installing relevant pipework): £900 – £1,500
  • Removal of old heating system (including old water tanks and copper piping) and comprehensive replacement of all materials and fittings: £1,500 – £2,500

As seen above, the overall combi boiler installation cost will vary for each specific scenario. It important for you to lay out your budget before shopping for combi boilers and installation prices; this way you will know exactly how much you are willing  to spend and can afford. It is also a good idea to look at several combi boilers before purchasing, as it is beneficial to shop around and compare quotes. This will ensure you get the best deal there is and also keep your combi boiler installation costs down

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